JPWO2020021887A1 - Image processing equipment, imaging equipment, image processing methods and programs - Google Patents

Abstract

The image processing device reads out the image data imaged by the image pickup element and transferred to the memory unit on which the optical noise is superimposed as area image data for each of the plurality of divided areas of the memory unit, and for each area image data. After the reading of the data is completed, the reading unit that reads the data in the predetermined area again and the captured image data that is captured by the imaging element and stored in the memory unit are according to the data read again by the reading unit. It includes an output unit that outputs corrected image data obtained by correcting each of a plurality of regions according to a fixed optical noise.

Description

The techniques of the present disclosure relate to image processing devices, imaging devices, image processing methods and programs.

A CMOS image sensor generally uses a sequential readout method called a rolling shutter. On the other hand, there is also known an image sensor that realizes an electronic global shutter by providing a charge storage unit adjacent to a pixel and transferring charges to the charge storage unit at the same time for all pixels while using a CMOS image sensor. When the global shutter method is adopted, the electric charge generated by the photoelectric conversion by the photoelectric conversion element is stored in the charge storage unit from the end of exposure until it is read out.

However, between the time when the electric charge is stored in the charge storage part and the time when it is read out as image information, the electric charge is generated in the charge storage part due to a cause other than exposure due to stray light to the photodiode and / or the charge storage part. May be superimposed. The superimposed charge becomes noise called optical noise, which adversely affects the captured image.

In order to reduce such noise, for example, Japanese Patent Application Laid-Open No. 2012-134756 exposes all the pixels at once, and drives the first transfer unit of all the pixels included in the pixel unit at the timing of the end of exposure. The light charges accumulated by the photoelectric conversion unit are collectively transferred only to the first storage unit, and the charges accumulated in the first storage unit are transferred to the first amplification unit, the first connection unit, and the first storage unit. It is read out as an optical signal via the output signal line, and the charge accumulated in the second storage unit is read through the second amplification unit, the second connection unit, and the second output signal line. , An image pickup device that controls to read out as an optical noise signal is disclosed. According to this configuration, since only the optical noise charge is accumulated in the second storage unit, it is said that the optical noise removal signal can be acquired.

Japanese Patent Application Laid-Open No. 2006-108888 describes the first row or column and the second row in an image pickup device of a method in which signal charges of all pixels are collectively transferred to a flooring division (FD) and then signals are sequentially read out. Alternatively, a solid-state image sensor is disclosed in which a signal in a column is subtracted to obtain a signal for one row or one column. According to this, it is possible to take out an image signal with a high S / N with an exposure time of all pixels at the same time, and for high-speed imaging such as strobe dimming signal, automatic focusing signal, electronic viewfinder, etc. It is said to be suitable.

Japanese Unexamined Patent Publication No. 2008-028516 includes a pixel unit in which a plurality of pixels having a photodiode, a charge storage unit, a transfer transistor, a reset transistor, an amplification transistor, and a selection transistor are arranged in a two-dimensional manner, and a photodiode signal is provided. A MOS-type image pickup element that resets all pixels at the same time, transfers a signal from the photodiode to the charge storage unit after a predetermined time, and then sequentially performs a signal read-out operation from the pixels, and a signal read-out operation from each pixel of the MOS-type image pickup device. A camera system configured by providing a throttle mechanism 3 as a means for changing the amount of incident light that suppresses the amount of light incident therein is disclosed. As a result, it is said that it is possible to provide a camera system having a global shutter function and capable of preventing signal deterioration and generation of false signals even when imaging a high-brightness subject.

Japanese Patent Application Laid-Open No. 2011-216966 describes a high-brightness detection unit of a signal processing unit that detects a voltage value corresponding to an overflow drain current value for each unit pixel of a pixel array unit as a light-receiving amount for each pixel, and a high-brightness detection unit. Based on the voltage value read by the detection unit, the order of the light receiving level is obtained line by line for the pixels that make up the pixel array unit, and the system control is performed by the level analysis unit registered in the address list and the information in the address list. An image pickup device including a signal processing unit that updates the address list of the unit and a system control unit that reads a received signal from the pixel array unit in order from the top of the row unit rank of the address list is disclosed. There is. This makes it possible to reduce the generation of noise when an image is captured by the image sensor.

However, the techniques disclosed in JP-A-2012-134756, JP-A-2006-108888, JP-A-2008-028516, and JP-A-2011-216966 are described in the machine of an image sensor or an image pickup apparatus. It is difficult to obtain an image sensor with suppressed optical noise without changing the specific configuration.

One embodiment of the present disclosure provides an image processing device, an image pickup device, an image processing method, and a program capable of obtaining an image pickup image in which optical noise is suppressed without changing the mechanical configuration of the image pickup device or the image pickup device. provide.

In the image processing apparatus according to the first aspect, the image data imaged by an image sensor provided with a plurality of photoelectric conversion elements and transferred to the memory unit on which optical noise is superimposed is transferred to a plurality of divided regions of the memory unit. Each of them is read out as area image data, and after the reading of each area image data is completed, the reading unit that reads out the data of the predetermined area again, and the captured image data that is captured by the image sensor and stored in the memory unit. However, the output unit includes an output unit that outputs the corrected image data obtained by correcting each of the plurality of regions according to the optical noise determined according to the data read again by the reading unit. As a result, it is possible to obtain an captured image in which optical noise is suppressed without changing the mechanical configuration of the imaging element or the imaging device.

In the image processing apparatus according to the second aspect, the predetermined area is the area first read from the memory unit. As a result, it is possible to acquire data of only the optical noise for the longest time, and it is possible to measure and correct the amount of optical noise that is closer to reality.

In the image processing apparatus according to the third aspect, the corrected image data is based on the comparison result of a pair of area image data in which the reading order by the reading unit is adjacent to each other, and the reading order by the reading unit is later than that of the region image data. A pixel position having noise is determined, and the image is corrected for each region according to the determined pixel position and the amount of optical noise. As a result, the position and amount of light noise generated can be determined separately and accurately.

In the image processing apparatus according to the fourth aspect, the comparison result is the difference between the image data of each of the pair of adjacent region image data. As a result, the position where the optical noise is generated can be accurately obtained.

In the image processing apparatus according to the fifth aspect, the plurality of photoelectric conversion elements have sensitivity for each of the plurality of predetermined primary colors. As a result, it can be applied to a color image sensor.

In the image processing apparatus according to the sixth aspect, each of the area image data is a group unit in which the image data stored in the memory unit has a predetermined arrangement of photoelectric conversion elements having sensitivity for each of a plurality of primary colors. It is the area image data thinned out by. This improves the detection accuracy of optical noise in the color image sensor.

In the image processing apparatus according to the seventh aspect, the comparison result is the result of comparison after the pair of region image data are simultaneously processed. This improves the detection accuracy of optical noise in the color image sensor.

In the image processing apparatus according to the eighth aspect, the pixel position is determined based on the result of filtering the comparison result of the pair of region image data, or the pair of region image data is filtered and then compared. The pixel position is determined based on the result. As a result, the optical noise detection accuracy when a thin or high-contrast subject is imaged by the low-pass filter processing is improved.

In the image processing apparatus according to the ninth aspect, when the predetermined imaging conditions are satisfied, the reading unit performs a process of reading the data again after the reading of each of the plurality of area image data is completed. As a result, the optical noise correction process can be executed only under the imaging conditions that require optical noise correction.

In the image processing apparatus according to the tenth aspect, the image pickup conditions are that the image pickup time by the image pickup device is shorter than the predetermined time, and the brightness is predetermined in the image data stored in the memory unit. This is at least one of the conditions that the image region exceeds the above. As a result, the optical noise correction process can be executed only under the above imaging conditions.

The image processing apparatus according to the eleventh aspect further includes an acquisition unit that acquires optical noise characteristic information from a storage unit in which optical noise characteristic information indicating optical noise characteristics for each of a plurality of regions is stored in advance, and corrects the image processing apparatus. The image data is obtained by correcting the captured image data for each region according to the optical noise and the optical noise characteristic information acquired by the acquisition unit. As a result, the optical noise correction can be performed accurately by acquiring the optical noise characteristic information in advance.

In the image processing apparatus according to the twelfth aspect, the optical noise characteristic information differs from a predetermined value as the optical noise of the region read again by the reading unit in the plurality of regions and the region among the plurality of regions. It is a value based on a ratio with a predetermined value as the optical noise of the region. As a result, optical noise correction can be performed quickly.

In the image processing apparatus according to the thirteenth aspect, the image data imaged by an image sensor provided with a plurality of photoelectric conversion elements and transferred to the memory unit on which optical noise is superimposed is transferred to a plurality of divided regions of the memory unit. A plurality of reading units that are read out as region image data for each, and a plurality of captured image data that are captured by the image sensor and stored in the memory unit according to optical noise determined according to the region image data read out for each region by the reading unit. Includes an output unit that outputs corrected image data obtained by correcting for each of the regions of. As a result, it is possible to obtain an captured image in which optical noise is suppressed without changing the mechanical configuration of the imaging element or the imaging device.

In the image processing apparatus according to the fourteenth aspect, the corrected image data is read from the area image data after which the reading order by the reading unit is later, based on the comparison result of the pair of area image data whose reading order is adjacent to each other. A pixel position having a difference is determined, and the image is corrected for each region according to the determined pixel position and the difference. As a result, it is possible to obtain an captured image in which optical noise is suppressed without changing the mechanical configuration of the imaging element or the imaging device.

In the image processing apparatus according to the fifteenth aspect, the area is obtained by thinning out the memory units of the photoelectric conversion elements arranged in a matrix system in a row unit by a predetermined method. Thereby, the technique of field reading can be applied.

The image processing device according to the sixteenth aspect further includes a control unit that controls the display unit to display an image based on the corrected image data output by the output unit. As a result, the corrected image data can be displayed.

The image pickup apparatus according to the seventeenth aspect includes an image processing apparatus according to any one of the first to fifteenth aspects, and a reception unit that receives an instruction to start imaging from the image pickup device. This makes it possible to obtain an image pickup device having an optical noise correction function.

In the image processing method according to the eighteenth aspect, the image data imaged by the image sensor and transferred to the memory unit on which the optical noise is superimposed is read out as area image data for each of the plurality of divided areas of the memory unit. In addition, after the reading of each area image data is completed, the data of the predetermined area is read again, and the captured image data captured by the image sensor and stored in the memory unit is determined according to the read data again. This includes outputting corrected image data obtained by correcting each of a plurality of regions according to noise.

In the image processing method according to the nineteenth aspect, the image data imaged by the image sensor and transferred to the memory unit on which the optical noise is superimposed is read out as area image data for each of the plurality of divided areas of the memory unit. , The corrected image data obtained by correcting the captured image data captured by the image sensor and stored in the memory unit for each of a plurality of regions according to the optical noise determined according to the region image data read out for each region. Including to output.

In the program according to the twentieth aspect, the image data captured by the computer with the image sensor and transferred to the memory unit on which the optical noise is superimposed is used as area image data for each of the plurality of divided areas of the memory unit. After the reading and the reading of each area image data are completed, the data of the predetermined area is read again, and the captured image data imaged by the image sensor and stored in the memory unit is determined according to the read data again. This is a program for executing a process including outputting corrected image data obtained by correcting each of a plurality of regions according to optical noise.

In the program according to the 21st aspect, the image data captured by the computer with the image sensor and transferred to the memory unit on which the optical noise is superimposed is used as area image data for each of the plurality of divided areas of the memory unit. Corrected image data obtained by correcting the captured image data read by the image sensor and stored in the memory unit for each of a plurality of regions according to the optical noise determined according to the region image data read out for each region. It is a program for executing processing including outputting.

The image processing device according to another embodiment is an image processing device having a processor and a memory, and the image data imaged by the processor by the image pickup element and transferred to the memory unit on which optical noise is superimposed is stored in the memory unit. After each of the plurality of divided areas is read as area image data and the reading of each area image data is completed, the data of the predetermined area is read again, imaged by the imaging element, and stored in the memory unit. A process including outputting the corrected image data obtained by correcting each of the plurality of regions according to the optical noise determined according to the data read again is executed.

The image processing device according to another embodiment is an image processing device having a processor and a memory, and the image data imaged by the processor by the image sensor and transferred to the memory unit on which optical noise is superimposed is stored in the memory unit. Each of the plurality of divided areas is read as area image data, and the captured image data captured by the image sensor and stored in the memory unit is according to the area image data read out for each area by the reading unit. A process including outputting the corrected image data obtained by correcting each of the plurality of regions according to the determined optical noise is executed.

According to one embodiment of the present disclosure, it is possible to obtain an captured image in which optical noise is suppressed without changing the mechanical configuration of the imaging element or the imaging device.

It is a schematic perspective view which shows an example of the appearance of the image pickup apparatus which concerns on 1st Embodiment. It is a rear view of the image pickup apparatus shown in FIG. It is a block diagram which shows an example of the main part structure of the electric system of the image pickup apparatus which concerns on 1st Embodiment. It is a block diagram which shows an example of the main part structure of the image pickup device which concerns on 1st Embodiment. It is a partially enlarged plan view of the image pickup device which concerns on 1st Embodiment. It is a time chart which reads image data from a memory part, FIG. 6A is a time chart which concerns on one Embodiment, and FIG. 6B is a time chart of the prior art. This is an example of a method for dividing the region of the image sensor according to the first embodiment. 8A shows an example of the arrangement of elements in each field, FIG. 8A shows the pixel arrangement of the first field, FIG. 8B shows the pixel arrangement of the second field, and FIG. 8C shows the pixel arrangement of the third field. It is a flowchart which shows an example of the flow of the difference acquisition processing which concerns on 1st Embodiment. It is a flowchart which shows an example of the flow of the image data difference acquisition processing which concerns on 1st Embodiment. It is a flowchart which shows an example of the flow of the noise position determination processing which concerns on 1st Embodiment. It is a noise map diagram which shows an example of the distribution mode of the captured image obtained by being imaged by the imaging apparatus which concerns on 1st Embodiment. It is a flowchart which shows an example of the flow of the field image correction processing which concerns on 1st Embodiment. It is a flowchart which shows an example of the flow of the noise position determination processing which concerns on 2nd Embodiment. It is a flowchart which shows an example of the flow of the noise position determination processing which concerns on 3rd Embodiment. It is a flowchart which shows an example of the flow of the noise position determination processing which concerns on 4th Embodiment. It is a flowchart which shows an example of the flow of the optical noise correction processing which concerns on 5th and 6th Embodiment. It is a flowchart which shows an example of the flow of the difference acquisition processing which concerns on 7th Embodiment. It is a flowchart which shows an example of the flow of the noise correction necessity processing which concerns on 8th Embodiment. It is a flowchart which shows the modification of the flow of the noise correction necessity processing which concerns on 8th Embodiment. It is a schematic diagram which shows an example of the embodiment which installs the program stored in the portable storage medium in the image pickup apparatus which concerns on 1st to 8th Embodiment. It is a perspective view which shows an example of the appearance of the smartphone which concerns on 9th Embodiment. It is a block diagram which shows an example of the main part structure of the electric system of the smartphone which concerns on 9th Embodiment.

First, the abbreviations used in the present specification will be described. "PLS" refers to the abbreviation for "Parasitic Light Sensitivity". "CMOS" refers to the abbreviation for "Complementary Metal Oxide Photophobia". “OVF” refers to the abbreviation for “Optical View Finder”. "EVF" refers to the abbreviation for "Electric View Finder". "LCD" refers to the abbreviation for "Liquid Crystal Display". “I / F” refers to the abbreviation for “Interface”. "CPU" refers to the abbreviation for "Central Processing Unit". "ROM" refers to the abbreviation of "Read Only Memory". "RAM" refers to the abbreviation for "Random Access Memory". "EEPROM" refers to an abbreviation for "Electrically Erasable Programmable Read Only Memory". "ASIC" refers to an abbreviation for "Application Special Integrated Circuit". “FPGA” refers to the abbreviation for “Field Programmable Gate Array”. "PLD" refers to the abbreviation for "Programmable Logic Device". "LAN" refers to the abbreviation for "Local Area Network". SSD refers to the abbreviation of "Solid State Drive". USB refers to the abbreviation of "Universal Serial Bus". DVD-ROM is an abbreviation for "Digital Versail Disc Read Only Memory". "SoC" refers to the abbreviation for "System On Chip". "IC" refers to an abbreviation for "Integrated Circuit". "PDA" refers to the abbreviation for "Personal Digital Assistants". "GPS" refers to the abbreviation of "Global Positioning System". "OLELD" refers to the abbreviation for "Organic Electroluminescence Display". "JPEG" refers to the abbreviation for "Joint Photographic Coding Experts Group". "RFID" refers to the abbreviation for "Radio Frequency Identification". "SIM" refers to the abbreviation of "Subscriber Identity Module". "UIM" refers to the abbreviation of "User Identity Module". “I / O” refers to the abbreviation for “Input / Output”.

(First Embodiment)
Hereinafter, an example of the embodiment of the technique of the present disclosure will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of the appearance of the image pickup apparatus 100 according to the first embodiment. FIG. 2 is a rear view of the image pickup apparatus 100 shown in FIG. Imaging devices to which the embodiments described below can be applied include imaging devices such as digital cameras and digital video cameras, imaging modules mounted on electronic endoscopes and mobile phones with cameras, and the like. Here, digital cameras Will be described as an example.

The image pickup apparatus 100 is an interchangeable lens camera, and is a digital camera including a camera main body 200 and an interchangeable lens 300 interchangeably attached to the camera main body 200, and the reflex mirror is omitted. Further, the camera body 200 is provided with a hybrid finder (registered trademark) 220. The hybrid finder 220 referred to here refers to, for example, a finder in which OVF and EVF can be selectively used.

The camera body 200 and the interchangeable lens 300 are interchangeably attached by combining the mount 256 provided on the camera body 200 and the mount 346 (see FIG. 3) on the interchangeable lens 300 side corresponding to the mount 256. The lens. The interchangeable lens 300 includes a photographing lens 16 and a focus lens 302, and sends an optical image of the subject to the image sensor of the camera body 200.

An OVF finder window 241 included in the hybrid finder 220 is provided on the front surface of the camera body 200. A finder switching lever 214 is provided on the front surface of the camera body 200. When the finder switching lever 214 is rotated in the direction of the arrow SW, an optical image that can be seen by the OVF and a live view image that is an electronic image that can be seen by the EVF are selectively displayed. The optical axis L2 of the OVF is an optical axis different from the optical axis L1 of the interchangeable lens 300. Further, on the upper surface of the camera body 200, a release button 211 and a dial 212 for setting a shooting mode or a playback mode are mainly provided.

On the back surface of the camera body 200 shown in FIG. 2, an OVF finder eyepiece 242, a display 213, a cross key 222, a menu key 224, and a selection button 225 are provided.

The cross key 222 functions as a multifunction key that outputs various command signals such as menu selection, zoom, and frame advance. The menu key 224 is an operation key that has both a function as a menu button for issuing a command to display a menu on the screen of the display unit 213 and a function as an OK button for commanding confirmation and execution of selected contents. is there. The selection button 225 is used for erasing display contents such as selected items and / or canceling specified contents, or returning to the previous operation state.

The display unit 213 is realized by, for example, an LCD, and is used for displaying a live view image which is an example of a continuous frame image obtained by being imaged in a continuous frame in a shooting mode. The "live view image" here is also generally called a "through image". The display unit 213 is also used for displaying a still image, which is an example of a single frame image obtained by capturing an image in a single frame when an instruction to capture a still image is given. Further, the display unit 213 is also used for displaying a reproduced image in the reproduction mode or displaying a menu screen or the like. The display unit 213 may be a touch panel display.

FIG. 3 is a block diagram showing an example of the configuration of a main part of the electrical system of the image pickup apparatus 100 according to the first embodiment.

The image pickup apparatus 100 is a digital camera that records captured still images and moving images, and the operation of the entire camera is controlled by the CPU 12. In addition to the CPU 12, the image pickup apparatus 100 includes an operation unit 14, an I / F unit 24, a primary storage unit 26, a secondary storage unit 27, an encoder 34, a display control unit 36, and an external I / F 39. Further, the image pickup apparatus 100 includes an image processing unit 28. The CPU 12 and the display control unit 36 are examples of the "control unit" according to the technology of the present disclosure. The CPU 12 controls the display unit 213 to display an image based on the corrected image data output by the display control unit 36. The operation unit 14 is an example of a "reception unit" according to the technique of the present disclosure. The reception unit receives an instruction from the user to start imaging on the image sensor.
Further, in the first embodiment, the display control unit 36 is provided as a hardware configuration different from the image processing unit 28, but the present invention is not limited to this, and the image processing unit 28 has the same function as the display control unit 36. In this case, the display control unit 36 becomes unnecessary. The CPU 12, the operation unit 14, the I / F unit 24, the primary storage unit 26, the secondary storage unit 27, the image processing unit 28, the encoder 34, the display control unit 36, and the external I / F 39 mutually via the bus 40. It is connected.

The primary storage unit 26 is a volatile memory used as a work area or the like when executing various programs. An example of the primary storage unit 26 is a RAM. The secondary storage unit 27 is a non-volatile memory in which various programs, various parameters, and the like are stored in advance. An example of the secondary storage unit 27 is an EEPROM, a flash memory, or the like. The CPU 12 reads various programs stored in the secondary storage unit 27 from the secondary storage unit 27, expands the read various programs in the primary storage unit 26, and controls each unit by executing the expanded programs. ..

The operation unit 14 includes a release button 211, a dial 212 for selecting a shooting mode and the like, a display unit 213, a finder switching lever 214, a cross key 222, a menu key 224, and a selection button 225. The operation unit 14 also includes a touch panel that receives various information. This touch panel is superimposed on the display screen of the display unit 213, for example. Various operation signals output from the operation unit 14 are input to the CPU 12.

The image processing unit 28 has a white balance gain unit and a gamma correction unit (not shown), and each processing unit sequentially performs signal processing on a RAW image which is an original digital signal temporarily stored in the primary storage unit 26. Do. That is, the white balance gain unit executes white balance by adjusting the gains of the R, G, and B signals. The gamma correction unit gamma-corrects each R, G, B signal for which WB is executed in the WB gain unit.

The encoder 34 converts the input signal into another type of signal and outputs the signal. The hybrid finder 220 has an LCD 247 that displays an electronic image. The display control unit 36 is connected to the display unit 213 and the LCD 247, respectively, and an image is displayed by the LCD 247 or the display unit 213 by selectively controlling the LCD 247 and the display unit 213. In the present embodiment, the display control unit 36 is an example of the “output unit” according to the technique of the present disclosure, and outputs various images to the display unit 213 or the LCD 247. In the following, when it is not necessary to distinguish between the display unit 213 and the LCD 247, the term “display device” is used.

The external I / F 39 is connected to a communication network such as LAN and / or the Internet, and controls transmission / reception of various information between the CPU 12 and an external device such as a server, a personal computer, and / or a printer via the communication network. .. Therefore, when the printer is connected as an external device, the image pickup apparatus 100 can output the captured still image to the printer and print it. Further, when the display is connected as an external device, the image pickup apparatus 100 can output the captured still image and / or the live view image to the display and display it.

The image light indicating the subject is imaged on the light receiving surface of the image sensor 20 via the photographing lens 16 and the shutter 18. The image pickup device 20 has a so-called electronic shutter function, and by activating the electronic shutter function, the charge accumulation time, that is, the exposure time of each photoelectric conversion element 51 is controlled. In the present embodiment, a CMOS sensor is adopted as an example of the image sensor 20, but the present invention is not limited to this, and any image sensor that can realize reading by the global shutter method and the rolling method described later may be used.

The image sensor 20 is a CMOS sensor in which a plurality of photoelectric conversion elements 51 are two-dimensionally arranged in the horizontal direction and the vertical direction. In the following, for convenience of explanation, the horizontal direction is also referred to as a row direction, and the vertical direction is also referred to as a column direction.

As an example, as shown in FIG. 4, the image pickup device 20 includes a photoelectric conversion element 51, a memory unit 53, and an image processing circuit 61. The photoelectric conversion element 51 takes an image of the subject according to the instruction received by operating the release button 211, and generates image data indicating the subject. Here, the image data generated by the photoelectric conversion element 51 is an example of "captured image data" according to the technique of the present disclosure. The memory unit 53 has a characteristic that optical noise is superimposed, and stores the image data transferred from the photoelectric conversion element 51. The image sensor 20 is connected to the bus 40 via the I / F unit 24.

The image processing circuit 61 is an example of a “reading unit” according to the technique of the present disclosure, and reads image data from the memory unit 53. The image processing circuit 61 reads out the image data transferred to the memory unit 53 as area image data for each of the plurality of divided areas of the memory unit 53. Then, the image processing circuit 61 reads out the data of the predetermined area again after the reading of each area image data is completed. Hereinafter, for convenience of explanation, the plurality of divided areas of the memory unit 53 are also simply referred to as “plurality of areas”. Further, the “predetermined area” referred to here refers to an area in the memory unit 53 in which the image data is first read as the area image data. The predetermined area is affected by the optical noise and accumulates data caused by the optical noise. In the following, for convenience of explanation, "data in a predetermined region" is also referred to as "optical noise data". Further, in the present embodiment, PLS is assumed as the optical noise, but PLS is merely an example, and may be other types of optical noise.

The image processing circuit 61 has a correction processing unit 62 and a storage unit 64. The correction processing unit 62 reads the image data stored in the memory unit 53 from the memory unit 53, and temporarily stores the read image data in the storage unit 64. The correction processing unit 62 generates corrected image data by correcting the image data stored in the storage unit 64 for each of a plurality of regions according to the optical noise determined according to the optical noise data. The corrected image data is an image in which the influence of optical noise is suppressed as compared with the image data stored in the storage unit 64.

The image processing circuit 61 may be an ASIC that is an integrated circuit in which circuits having a plurality of functions related to image processing are integrated into one. Further, for example, the image processing circuit 61 may have another hardware configuration such as a computer including a CPU, ROM and RAM, an FPGA, or a PLD. Further, for example, the image processing circuit 61 may be a combination of two or more types of hardware configurations such as ASIC, FPGA, PLD, and a computer.

As an example, as shown in FIG. 5, in the image pickup element 20, a large number of units surrounded by a broken line including a photoelectric conversion element 51, a memory unit 53, and a floating diffusion unit 55 are arranged in the row direction. In this embodiment, one column in the horizontal direction is referred to as a row. One row in the vertical direction is called a row. For example, assuming that the upper row in FIG. 5 is the (x) row, the lower row is the (x + 1) row. If the left column in the figure is the (y) column, the right column is the (y + 1) column. In the example shown in FIG. 5, the memory unit 53 is provided adjacent to the photoelectric conversion element 51 in the lateral direction, but the positional relationship between the memory unit 53 and the photoelectric conversion element 51 is not limited to this. For example, the memory unit 53 may be arranged above or below the photoelectric conversion element 51. Further, for example, the memory unit 53 may be arranged so as to overlap the photoelectric conversion element 51.

When the user presses the release button 211 of the image pickup apparatus 100, all the pixels of the photoelectric conversion element 51 are reset. Next, the photoelectric conversion element 51 is activated for the set charge accumulation time to convert light into signal charges. When the exposure is completed, the signal charge generated during the exposure is transferred to the memory unit 53 by the so-called global shutter method. That is, for example, the signal charges accumulated in the photoelectric conversion elements 51 of all the effective pixels are collectively transferred to the memory unit 53 in synchronization with the transfer signal. The "signal charge" here refers to the charge generated by imaging the subject. Further, the signal charge corresponds to image data indicating the subject. Although the global shutter method is illustrated here, the rolling shutter method can also be applied.

The signal charge temporarily stored in the memory unit 53 is sequentially read from the floating diffusion unit 55 as a digital signal according to the signal charge by the read signal input from the image processing circuit 61. Here, the method of sequentially reading the signal charges is also called a so-called rolling method. As an example, in the configuration shown in FIG. 5, the signal charges from the memory units 53 of the two adjacent rows are read out from one floating diffusion unit 55.

Since the reading is, for example, a row-by-row rolling method, it takes a certain amount of time to read the signal charges of all the memory units 53. During that time, noise charges due to stray light or the like generated in the photoelectric conversion element 51 and / or the memory unit 53 are superimposed on the signal charges. For example, when the memory unit 53 does not have a light-shielding member and is exposed to external light, the optical noise from the memory unit 53 is superimposed on the signal charge. Therefore, the image data stored and read out in the memory unit 53 is the captured image data in which optical noise is superimposed on the image data obtained by capturing the subject. In the following, for convenience of explanation, the image before correction on which optical noise is superimposed is also referred to as a captured image. In the present embodiment, the following processing is performed in order to remove the superimposed optical noise from the captured image.

FIG. 6 is an example of a time chart (horizontal axis is time) for reading out image data accumulated in the exposure time and stored in the memory unit 53. In the present embodiment, as shown in FIG. 6A as an example, in the reading of the image data stored in the memory unit 53 by the image processing circuit 61, the memory unit 53 is divided into three areas, and the areas are divided into three areas in a predetermined order. Do it every time. The "three regions" referred to here are an example of the above-mentioned "plurality of regions".

In the present embodiment, the image processing circuit 61 first reads out the image data of the first region by a rolling method, for example, as shown by “F1” in FIG. 6A. Next, the image processing circuit 61 reads out the image data in the second region by a rolling method, for example, as shown by “F2” in FIG. 6A. Next, the image processing circuit 61 reads out the image data in the third region by a rolling method, for example, as shown by “F3” in FIG. 6A. Finally, the image processing circuit 61 re-reads the first region that was first read, as shown by, for example, “RF1” in FIG. 6A.

When the first region is read again, the image processing circuit 61 does not read the signal charge of the imaging target generated by the photoelectric conversion element 51, but the light generated in the first region after first reading the first region. The above-mentioned optical noise data corresponding to the noise component is read out. In the following, re-reading the area that the image processing circuit 61 has read once is also referred to as "blank reading".

The reading order of each region is not particularly limited, but it is preferably determined in relation to the region division method described later. Further, the blank reading area is preferably the area where the reading is performed first. The reason will be described later.

FIG. 6B is a time chart showing a conventional method of sequentially reading from the first row to the last row by a rolling method without dividing the memory unit 53. This reading method is called normal reading. In the present embodiment, the image processing circuit 61 can use a divided reading method for dividing and reading the image data and a normal reading method for sequentially reading the image data without dividing the image data, depending on the imaging conditions.

Here, how to divide the area in the memory unit 53 will be described. The image sensor 20 is divided into a plurality of regions in advance according to the color division of the pixels. The area is divided so that the signal charge stored in the memory unit 53 is evenly divided. More specifically, the pixels of the photoelectric conversion element 51 corresponding to the storage element included in each region are divided so as to be evenly distributed in position in the imaging region. Since the storage elements of the memory unit 53 are provided adjacent to each of the pixels of the photoelectric conversion element 51, evenly dividing the pixels of the photoelectric conversion element 51 means that the memory unit 53 is evenly divided. means. By dividing in this way, the entire captured image is evenly divided into region image data which is image data of each region.

An example of the method of dividing the area is shown in FIG. In the example shown in FIG. 7, the image sensor 20 has 4896 pixels in the row direction and 3264 pixels in the column direction, and the number of pixels is (4896 × 3264) and the aspect ratio is 3: 2. However, the number of pixels and the aspect ratio are not limited to this.

In the present embodiment, as shown in FIG. 7, pixels arranged in a matrix manner are periodically thinned out row by row and assigned to one area. Specifically, the pixels are allotted to one area by thinning out one line every three lines. That is, the pixels in the first row are assigned to the first region, the pixels in the second row are assigned to the second region, and the pixels in the third row are assigned to the third region. In the present specification, thinning out means extracting a part. In the following, the "area" is also referred to as a "field".

Similarly, in the fourth and subsequent rows, the pixels in the fourth row are assigned to the first field, the pixels in the fifth row are assigned to the second field, and the pixels in the sixth row are assigned to the third field in this order. That is, when the line number is divided by 3, which is the number of fields, the pixels of the line with a remainder of 1 are in the first field, the pixels of the line with a remainder of 2 are in the second field, and the line number is divisible by 3. Pixels are assigned to the third field. Such an allocation is made for the pixels in every row. Here, the fact that the pixels of the image sensor 20 are periodically thinned out line by line and assigned to one area to be divided into a plurality of areas is also referred to as "field division".

As shown in FIG. 7 as an example, the image sensor 20 has sensitivity for each of a plurality of predetermined primary colors. That is, the image sensor 20 is capable of color photographing. In the present embodiment, three color filters of R (red), G (green), and B (blue) are arranged on each photoelectric conversion element 51. As a method of arranging the color filter, there are a Bayer array, a WRGB array, a clear bit array, and the like.

In the present embodiment, the color filter arrangement of the image sensor 20 maintains an appropriate color filter arrangement in each field even if the fields are divided into rows. Specifically, in the first line, the R filter, the G filter, the R filter, the G filter, and the R filter and the G filter are arranged alternately from the left. In the second line, the G filter, the B filter, the G filter, the B filter, and the G filter and the B filter are arranged alternately. Hereinafter, the odd-numbered rows have the same array as the first row, and the even-numbered rows have the same array as the second row.

When the color-divided pixels are field-divided by the method shown in FIG. 7, the first to third fields have the arrangements shown in FIGS. 8A to 8C. In each field, pixels of 1088 rows × 1632 columns are arranged. Further, as shown in FIGS. 8A to 8C, the arrangement of the three colors is the same in the first field to the third field, and the arrangement is the same as the arrangement of the entire region before the division. By arranging all the pixels as shown in FIG. 7, the arrangement of each field at the time of division becomes the same, so that the detection accuracy of optical noise at the time of performing field division reading becomes high. The method of color division is not limited to the method of using a color filter, and there are, for example, a method of using a prism, a method of laminating photodiodes, a method of laminating organic photoelectric films, and the like.

As described above, one row in which the photoelectric conversion elements 51 having sensitivity for each of the plurality of primary colors have a predetermined arrangement is a group unit. Then, since all the rows are periodically thinned out to the same region, each region includes the pixels of the photoelectric conversion element 51 in which the pixels of all the photoelectric conversion elements 51 are evenly divided into three. In the present embodiment, the memory unit 53 is divided into three areas, but the number of divided areas is not limited to this and is arbitrary. Then, in the case of dividing into X, the line number is divided by X, the pixel of the 1 remaining line is the 1st field, the pixel of the 2 remaining lines is the 2nd field, and the pixel of the divisible line is the X field. And assign.

If each area can be divided so that all the signal charges stored in the memory unit 53 are evenly divided, the area division is not limited to the above method. For example, one line of pixels may be allocated to a plurality of areas. Further, a plurality of lines may be collectively assigned to one area.

Next, an example of a method for removing optical noise according to the technique of the present disclosure of the image pickup apparatus 100 will be described with reference to FIGS. 9 to 13.

In the optical noise removal method, first, the comparison result between the fields is acquired. In the present embodiment, the comparison result is the difference between the image data of each pair of adjacent region image data. The fields for which the difference is to be taken are a pair of fields in which the reading order is adjacent. The region image data is corrected based on the comparison result of a pair of region image data whose reading order is adjacent to each other by the correction processing unit 62. As described above, the correction processing unit 62 first reads the first field, and then reads the second field and the third field in this order. Therefore, the correction processing unit 62 calculates the difference between the first field and the second field. Further, the correction processing unit 62 calculates the difference between the second field and the third field. When the number of fields is three, the process of acquiring the difference is completed. However, when the number of fields is four or more, the correction processing unit 62 acquires the difference up to the last field in the same manner.

As an example, in the difference acquisition process shown in FIG. 9, first, in step S100, the initial value 2 is stored in the field number register M. In the next step S102, the correction processing unit 62 reads out the image data of the Mth field and the (M-1) th field.

Hereinafter, for convenience of explanation, the image data of each field will be referred to as "field image data" or simply "image data". The field image data is a set of pixel-by-pixel data read from the memory unit 53 and stored in the storage unit 64. As described above, the pixels are arranged in 1088 rows × 1632 columns in each field. Here, the number of rows is x, the number of columns is y, and the pixels in the xth row and yth column are represented as [x, y]. Then, the pixel data of [x, y] of the image data in the M field is expressed as Image M [x, y], and the pixel data of the coordinates [x, y] of the image data in the (M-1) field is Image. (M-1) Notated as [x, y]. However, x is from 1 to 1088 and y is from 1 to 1632.

In the next step S104, the correction processing unit 62 acquires a difference obtained by subtracting the image data of the (M-1) field from the image data of the M field. The difference is obtained by subtracting the image data of the field whose read order is earlier from the image data of the field whose read order is later. That is, the difference is obtained by subtracting the data at the same [x, y] coordinates of each field.

Here, the process of step S104 will be described in detail with reference to FIG. As an example, in the image data difference acquisition process shown in FIG. 10, first, in step S110, x = 1 and y = 1 are set as the processing coordinates [x, y] of the Mth field and the (M-1) field in the coordinate register. Be remembered. Next, in step S112, DifDataM [1,1] obtained by subtracting the pixel data of the [1,1] coordinates of the (M-1) field from the pixel data of the [1,1] coordinates of the Mth field is stored in the storage unit. It is stored in 64. DifDataM [1,1] is the difference between the [1,1] coordinates of the Mth field and the (M-1) th field.

In the next step S114, the correction processing unit 62 increments the y-coordinate of the coordinate register by 1, and then proceeds to step S116.
In step S116, the correction processing unit 62 determines whether or not the value of y exceeds 1632. If the value of y is 1632 or less in step S116, the determination is denied, and the image data difference acquisition process returns to step S112. If the value of y exceeds 1632 in step S116, the determination is affirmed, and the image data difference acquisition process proceeds to step S118.

In step S118, the correction processing unit 62 increments the value of x in the coordinate register by one and returns the value of y to 1.

In the next step S120, the correction processing unit 62 determines whether or not the value of x exceeds 1088. If the value of x is 1088 or less in step S120, the determination is denied, and the image data difference acquisition process returns to step S112. If the value of x exceeds 1088 in step S120, the determination is affirmed, and the correction processing unit 62 ends the image data difference acquisition process.
In the above processing, the difference is taken for each corresponding pixel, but for example, the difference may be taken for each corresponding line.

By executing the image data difference acquisition process, the correction processing unit 62 obtains the difference for each pixel. The obtained difference data is stored in the storage unit 64. The difference between all pixels is referred to as the difference data DifDataM [x, y] in the Mth field. The image difference data in the M field is used for correcting the image data in the M field.

Returning to FIG. 9, in step S106, the correction processing unit 62 determines whether or not M is the same as the number of fields. If M is different from the number of fields in step S106, the determination is denied and the difference acquisition process proceeds to step S108. In step S108, the correction processing unit 62 increments M by one, and the difference acquisition process returns to step S102. In step S106, if M is the same as the number of fields, the determination is affirmed, and the correction processing unit 62 ends the difference acquisition process. By executing the above difference acquisition process, the correction processing unit 62 obtains (M-1) image difference data from the second field to the M field.

Next, the correction processing unit 62 performs noise position determination processing for determining the pixel position having optical noise. The noise position determination process refers to a process of determining whether or not the difference data for each coordinate is noise in each field to determine the noise position.

As an example, in the noise position determination process shown in FIG. 11, first, in step S130, the initial value 2 is stored in the field number register M.

In the next step S132, the correction processing unit 62 takes in the difference data DifDataM [x, y] of the second field from the storage unit 64. In the next step S134, x = 1 and y = 1 are stored as coordinate data in the coordinate register.
In the next step S136, the correction processing unit 62 determines whether or not the DifDataM [1, 1] is larger than the predetermined threshold value T1. Here, the threshold value T1 is, for example, the amount of optical noise data for one pixel obtained by superimposing optical noise on the signal charge for one pixel stored in the memory unit 53, and is tested by an actual machine and / Or, it refers to a value obtained in advance by computer simulation or the like.
In step S136, if DifDataM [1, 1] is larger than the predetermined threshold value T1, the determination is affirmed, and the noise position determination process shifts to step S138. In step S136, if DifDataM [1, 1] is equal to or less than the predetermined threshold value T1, the determination is denied and the noise position determination process proceeds to step S140.
In step S138, the correction processing unit 62 assigns “1”, which is a value indicating the existence of optical noise, to the noise map NmapM [1, 1], and then the noise position determination process is performed in step S142. Move to.
In step S140, the correction processing unit 62 assigns “0”, which is a value indicating that no optical noise exists, to the noise map NmapM [1, 1], and then the noise position determination process is performed in step S142. Move to.

In the next step S142, the correction processing unit 62 determines whether or not all the difference data DifDataM [x, y] in the M field have been determined. If all the difference data DifDataM [x, y] in the M field are not determined in step S142, the determination is denied and the noise position determination process proceeds to step S144. When all the difference data DifDataM [x, y] in the M field are determined in step S142, the determination is affirmed and the noise position determination process proceeds to step S146.
In step S144, the correction processing unit 62 increments the x-coordinate or the y-coordinate by one, and then the noise position determination process returns to step S136. Since the procedure for incrementing the coordinates conforms to the method shown in FIG. 10, detailed description thereof will be omitted.
In step S146, the correction processing unit 62 determines whether or not M is the same as the number of fields. If M is different from the number of fields in step S146, the determination is denied and the noise position determination process proceeds to step S148.
In step S148, the correction processing unit 62 increments the value of M by one, then the noise position determination processing returns to step S132, and the correction processing unit 62 returns to the next field, the (M + 1) field. The processing is executed in order from step S132.
In step S146, if M is the same as the number of fields, the determination is affirmed, and the correction processing unit 62 ends the noise position determination process.
As described above, the pixel position having the optical noise in the field whose reading order is later is determined from the difference between the image data of the two fields whose reading orders are adjacent to each other.

By the noise position determination process, a noise map NmapM [x, y] in which the coordinate position of the noise is determined is obtained for each field. By executing the process of step S138 or the process of step S140, binary data of "1" or "0" is added to the coordinates of the noise map. Here, the reason for binarizing the coordinates of the noise map is that the amount of optical noise is smaller than the signal charge of the subject. Therefore, when the difference between adjacent fields is taken, the obtained optical noise may be mixed with the signal charge of the subject in the background and the error may become large. Therefore, the noise map is used to determine whether or not optical noise has occurred, that is, to determine the position where optical noise is generated.

FIG. 12 is a noise map diagram in which the portion where the binary data given to the noise map is “1” is shown in white and the portion where the binary data given to the noise map is “0” is shown in black. This is an example. In the example shown in FIG. 12, the white portion indicates the position where the optical noise is generated.

Next, the correction processing unit 62 performs field image correction processing. The field image correction process refers to a process of correcting image data in each field using the noise map NmapM [x, y].

As an example, in the field image correction process shown in FIG. 13, first, in step S150, the correction processing unit 62 takes in the blank reading data Ndata [x, y] of the first field into the storage unit 64.

In the next step S152, the initial value 2 is stored in the field number register M. In the next step S154, the correction processing unit 62 takes in the image data ImageM [x, y] of the Mth field into the storage unit 64. In the next step S156, the correction processing unit 62 takes in the noise map NmapM [x, y] of the Mth field into the storage unit 64. In the next step S158, x = 1 and y = 1 are stored as coordinate data in the coordinate register.

In the next step S160, the correction processing unit 62 corrects the image data ImageM [x, y] of the processing coordinates by using the blank reading data Ndata [x, y] and the noise map NmapM [x, y]. Specifically, the product of the blank reading data and the noise map is subtracted from the image data for each processing coordinate. That is, assuming that the corrected image data is CIMageM [x, y], it is expressed as "CimageM [x, y] = ImageM [x, y] -Ndata [x, y] x NmapM [x, y]". ..

The data of the noise map NmapM [x, y] shows the coordinate positions where the optical noise is generated. That is, the data at the position where it occurs is "1", and the data at the position where it does not occur is "0". On the other hand, in the blank reading data, since only the generated optical noise is read out, the accuracy of the numerical value is high. Therefore, by combining the noise map data and the blank reading data, the position and the amount of optical noise generated can be accurately determined.

In step S162, the correction processing unit 62 determines whether or not the image data of all the coordinates has been corrected. If the image data of all the coordinates is not corrected in step S162, the determination is denied and the field image correction process proceeds to step S164. When the image data of all the coordinates are corrected in step S162, the determination is affirmed, and the field image correction process proceeds to step S166.

In step S164, the correction processing unit 62 increments the x-coordinate or the y-coordinate, and then the field image correction processing shifts to step S160. Since the procedure for incrementing the coordinates conforms to the method shown in FIG. 10, detailed description thereof will be omitted.
In step S166, the correction processing unit 62 determines whether or not M is the same as the number of fields. If M is different from the number of fields in step S166, the determination is denied and the field image correction process proceeds to step S168.
In step S168, the correction processing unit 62 increments M by one and sequentially executes processing for the next (M + 1) field from step S154.
In step S166, if M is the same as the number of fields, the determination is affirmed, and the correction processing unit 62 ends the field image correction processing.

By the above processing, corrected image data from the second field to the M field can be obtained. The correction processing unit 62 can obtain one corrected image by combining the image data of the first field read first and the corrected image data from the second field to the M field.

In the present embodiment, in the pair of fields in which the reading order is adjacent, the photoelectric conversion elements 51 of each field are adjacent in row units. Since the adjacent photoelectric conversion elements 51 are very close to each other, it is considered that the difference in the image data of the subject stored in these memory units 53 at the same exposure time is very small. Therefore, if the difference between the image data stored in these adjacent memory units 53 is large, it is highly probable that it is due to optical noise. In the present embodiment, this feature is used to take the difference between the reading order, that is, the pair of fields in which the arrangement positions are adjacent to each other, and remove the optical noise.

Further, in the present embodiment, the first field read first is read blank at the end. By blank reading, after the first reading, the optical noise generated in the first field while reading the second field and the third field is read. This is the optical noise actually generated in the first field, and it is considered that the same degree of optical noise is also generated in the second field and the third field.

The field to be read blank does not have to be the first field read first, but the time until the field to be read blank is reduced in other fields. Therefore, the amount of light noise actually measured is proportionally converted from the time until the last field is read out. Therefore, in order to measure the optical noise for the longest time, it is preferable to read the field in which the area image data is first read from the memory unit 53 last.

According to the above first embodiment, the position where the optical noise is generated and the amount of the optical noise can be determined separately and accurately. Then, by correcting the captured image using the determined optical noise data, it is possible to obtain an captured image in which the optical noise is suppressed without changing the mechanical configuration of the image pickup device or the image pickup device.

The above embodiment can be applied to, for example, taking a still image. Further, for example, in the continuous shooting mode, it is possible to perform the above processing every time one image is taken. Alternatively, if the correction information obtained by applying this method at the time of the first shooting is stored and the captured image taken is corrected using the correction information in the subsequent shooting, the speed is increased. Moreover, it is possible to obtain a continuous shooting image with less optical noise.

Further, in the first embodiment, the correction processing unit 62 integrated with the image sensor 20 performs optical noise correction processing. However, the correction processing unit 62 does not necessarily have to perform the optical noise correction processing. For example, the CPU 12 may read the optical noise correction program stored in the secondary storage unit 27 and perform the optical noise correction processing.

(Second Embodiment)
Next, the second embodiment will be described as an example with reference to the flowchart shown in FIG. Items not described below, such as the mechanical configuration of the image pickup device 100 or the image pickup device 20, are the same as those in the first embodiment. Further, in the case of the same processing as in the first embodiment, there is a part in which the explanation is simplified by using the same data name. Further, the modified example of the first embodiment can also be applied to the following embodiments.

In the image pickup apparatus 100 according to the second embodiment, the noise map NmapM [x, y] is created after the image data of each field is simultaneously processed. Here, the simultaneousization refers to a process of interpolating the data of adjacent pixels having different colors for each pixel to include the data of all colors when the image sensor 20 is capable of color photographing. Specifically, the correction processing unit 62 performs color interpolation processing corresponding to the arrangement of the color filters of the image sensor 20 to generate simultaneous R, G, and B signals.

As an example, in the noise position determination process shown in FIG. 14, first, in step S200, the initial value 2 is stored in the field number register M, and then the noise position determination process shifts to step S202.

In step S202, the correction processing unit 62 takes in the image data of the M field and the (M-1) field stored in the storage unit 64, and then the noise position determination process shifts to step S204. To do.

In step S204, the correction processing unit 62 simultaneously synchronizes the image data in the M field and the image data in the (M-1) field. That is, the correction processing unit 62 performs color interpolation processing corresponding to the arrangement of the color filters for each pixel of each field, and generates simultaneous R, G, and B signals.

In the next step S206, the correction processing unit 62 acquires the difference data DifDataM [x, y] obtained by subtracting the simultaneous image data of the (M-1) field from the simultaneous image data of the M field. The difference data DifDataM [x, y] is obtained by subtracting the data at the same [x, y] coordinates of each field. Since the method of obtaining the difference is as described with reference to FIG. 10, detailed description thereof will be omitted. The difference acquired by the correction processing unit 62 is stored in the storage unit 64.

In the next step S208, the correction processing unit 62 takes in the acquired difference data DifDataM [x, y], and then the noise position determination process shifts to step S210.

In step S210, x = 1 and y = 1 are stored as coordinate data in the coordinate register, and then the noise position determination process shifts to step S212.

In step S212, the correction processing unit 62 determines whether or not the difference between the coordinates [1, 1] is larger than the predetermined threshold value T2. Here, the threshold value T2 is, for example, the amount of optical noise data for one pixel obtained by superimposing optical noise on the signal charge for one pixel stored in the memory unit 53, and is tested by an actual machine and / Or, it refers to a value obtained in advance by computer simulation or the like.

In step S212, when the difference between the coordinates [1, 1] is larger than the predetermined threshold value T2, the determination is affirmed, and the noise position determination process shifts to step S214. In step S214, the correction processing unit 62 assigns “1”, which is a value indicating the existence of optical noise, to the noise map NmapM [1, 1], and then the noise position determination process is performed in step S218. Move to. In step S212, if the difference between the coordinates [1, 1] is equal to or less than the predetermined threshold value T2, the determination is denied and the noise position determination process proceeds to step S216. In step S216, the correction processing unit 62 assigns “0”, which is a value indicating that no optical noise exists, to the noise map NmapM [1, 1], and then the noise position determination process is performed in step S218. Move to.

In step S218, the correction processing unit 62 determines whether or not the difference has been determined for all the coordinates. If the difference is not determined for all the coordinates in step S218, the determination is denied and the noise position determination process proceeds to step S220. When the difference is determined for all the coordinates in step S218, the determination is affirmed, and the noise position determination process proceeds to step S222.

In step S220, the correction processing unit 62 increments the x-coordinate or the y-coordinate, and the noise position determination process returns to step S212.

In step S222, the correction processing unit 62 determines whether or not M is the same as the number of fields. If M is not the same as the number of fields in step S222, the determination is denied and the noise position determination process proceeds to step S224.

In step S224, the correction processing unit 62 increments M by one and sequentially executes processing for the next (M + 1) field from step S202.

In step S222, if M is the same as the number of fields, the determination is affirmed, and the correction processing unit 62 ends the noise position determination process.

As shown in FIG. 8 as an example, all the colors of R, G, and B are available in each field. Further, since each field is an image obtained by periodically thinning out pixels from all pixels, the subject position is slightly different, and pixels of the same color do not overlap. Therefore, according to the image pickup apparatus 100 according to the second embodiment described above, by simultaneously synchronizing each field and interpolating and comparing each color, it becomes easier to compare between each field, and the noise map NmapM with less error. [X, y] can be created.

(Third Embodiment)
Next, the third embodiment will be described as an example with reference to the flowchart shown in FIG. In addition, in the case of the same processing as the first embodiment or the second embodiment, there is a part where the explanation is simplified by using the same data name.

In the image pickup apparatus 100 according to the third embodiment, the noise map NmapM [x, y] is created after the image data in each field is subjected to low-pass filter processing. Hereinafter, a detailed description will be given.

As an example, in the noise position determination process shown in FIG. 15, first, in step S300, the initial value 2 is stored in the field number register M, and then the process proceeds to step S302.

In step S302, the correction processing unit 62 takes in the image data of the M field and the (M-1) field stored in the storage unit 64, and then the noise position determination process shifts to step S304. To do.

In step S304, the correction processing unit 62 performs low-pass filter processing on each of the image data in the M field and the image data in the (M-1) field. That is, the correction processing unit 62 removes the high frequency component of the pixel data.

In the next step S306, the correction processing unit 62 acquires the difference data DifDataM [x, y] between the low-pass filtered image data of the M field and the low-pass filtered image data of the (M-1) field. .. The correction processing unit 62 stores the acquired difference in the storage unit 64.

The processing after step S308 shown in FIG. 15 is different from the processing after step S208 of the noise position determining processing shown in FIG. 14 in that the processing of step S312 is performed instead of the processing of step S212. The process of step S312 is different from the process of step S212 in that the threshold value T3 is adopted instead of the threshold value T2. Here, the threshold value T3 is, for example, the amount of optical noise data for one pixel obtained by superimposing optical noise on the signal charge for one pixel stored in the memory unit 53, and is tested by an actual machine and / Or, it refers to a value obtained in advance by computer simulation or the like.

Hereinafter, the processing after step S308 shown in FIG. 15 is substantially the same as the processing after step S208 of the noise position determination processing shown in FIG. 14 as an example, and thus will be briefly described.

The correction processing unit 62 takes in the stored difference and compares the difference with a predetermined threshold value T3. The correction processing unit 62 assigns “1” to the noise map NmapM [1, 1] when the difference is larger than the threshold value T3, and assigns “1” to the noise map NmapM [1, 1] when the difference is equal to or less than the threshold value T3. On the other hand, by adding "0", a noise map is generated.

According to the third embodiment, since each field is an image obtained by periodically thinning out pixels, a high-frequency subject such as an elongated subject or a subject having high contrast is placed on one side at the same coordinate position in adjacent fields. Sometimes only the field is not shown. In that case, if the difference is taken, it may be erroneously determined that optical noise has occurred at the coordinates. Even in such a case, the boundary can be loosened by applying a process of narrowing down the high frequency band with a low-pass filter or the like, the detection error can be reduced, and a noise map NmapM [x, y] with less error can be created. Can be done.

(Fourth Embodiment)
Next, the fourth embodiment will be described as an example with reference to the flowchart shown in FIG. In the image pickup apparatus 100 according to the fourth embodiment, the noise position is determined by executing the filter processing in the same manner as in the third embodiment, but unlike the third embodiment, the difference in the image data of each field. Is calculated before the filtering process is executed. In the following description, in the case of the same processing as in the third embodiment, there is a part in which the description is simplified by using the same data name.

As an example, in the noise position determination process shown in FIG. 16, first, in step S340, the initial value 2 is stored in the field number register M, and then the noise position determination process shifts to step S342.

In step S342, the correction processing unit 62 takes in the image data of the M field and the image data of the (M-1) field stored in the storage unit 64, and then the noise position determination process proceeds to step S344. Transition.

In step S344, the correction processing unit 62 acquires the difference data DifDataM [x, y] between the image data in the M field and the image data in the (M-1) field, and then the noise position determination process is performed in step S. Move to S346.

In step S346, the correction processing unit 62 performs low-pass filter processing on the acquired difference.

The processing after step S348 shown in FIG. 16 is different from the processing after step S308 of the noise position determining processing shown in FIG. 15 in that the processing of step S352 is performed instead of the processing of step S312. The process of step S352 is different from the process of step S312 in that the threshold value T4 is adopted instead of the threshold value T3. Here, the threshold value T4 is, for example, the amount of optical noise data for one pixel obtained by superimposing optical noise on the signal charge for one pixel stored in the memory unit 53, and is tested by an actual machine and / Or, it refers to a value obtained in advance by computer simulation or the like.

Hereinafter, the processing after step S348 shown in FIG. 16 is substantially the same as the processing after step S308 of the noise position determination processing shown in FIG. 15 as an example, and thus will be briefly described.

The correction processing unit 62 takes in the difference processed by the low-pass filter and compares it with the threshold value T4. The correction processing unit 62 assigns “1” to the noise map NmapM [1, 1] when the difference is larger than the threshold value T4, and assigns “1” to the noise map NmapM [1, 1] when the difference is equal to or less than the threshold value T4. On the other hand, by adding "0", a noise map is generated.

The effect of the fourth embodiment is the same as the effect of the third embodiment. Since each field is an image obtained by periodically thinning out pixels, a high-frequency subject such as an elongated subject or a subject with strong contrast may not appear in one field at the same coordinate position of adjacent fields. .. In that case, a large numerical value may be obtained by taking the difference. Even in such a case, the numerical value can be reduced by applying a process of narrowing the high frequency band to the difference with a low-pass filter or the like, the detection error can be reduced, and the noise map NmapM [x, y] with less error can be obtained. Can be created.

(Fifth Embodiment)
Next, the fifth embodiment will be described as an example with reference to the flowchart shown in FIG. In the image pickup apparatus 100 according to the fifth embodiment, optical noise correction of image data is performed using optical noise characteristic information. The optical noise characteristic information is information for calculating the amount of optical noise generated in each field from the amount of optical noise in the first field that has been read blank, and is stored in advance in the storage unit 64 or the primary storage unit 26.

The optical noise characteristic information is defined for each image sensor 20. The optical noise characteristic information is acquired at the time of manufacture or before shipment as a characteristic value of how much optical noise is generated in which field of the memory unit 53 divided into fields in advance, and is stored in the storage unit 64 or the primary storage unit. It is stored in 26. In the image pickup apparatus 100 according to the fifth embodiment, the optical noise characteristic information is stored in a format such as a calculation formula or a conversion coefficient, but the technique of the present disclosure is not limited to this and is stored in a table. You may.

The optical noise characteristic information may be specified for each pixel in each field. Alternatively, the optical noise characteristic information may be data corresponding to a plurality of pixels in a certain range. Further, in the case of an image sensor having color sensitivity, since the amount and frequency of light noise generated differ depending on the color, it is preferable to specify the light noise characteristic information for each element of each color. The optical noise characteristic information may be different for each pixel, each range, or each region. In the following, it is assumed that the optical noise characteristic information of the M field is defined for each pixel, and is represented by CdataM [x, y].

As an example, in the optical noise correction processing shown in FIG. 17, first, in step S400, the correction processing unit 62 takes in the blank reading data Ndata [x, y] of the first field stored in the storage unit 64, and then takes in the blank reading data Ndata [x, y]. The optical noise correction process proceeds to step S402.

In step S402, the initial value 2 is stored in the field number register M, and then the optical noise correction process shifts to step S404.

In step S404, the correction processing unit 62 takes in the image data ImageM [x, y] of the Mth field, and then the optical noise correction processing shifts to step S406.

In step S406, the correction processing unit 62 takes in the noise map NmapM [x, y] of the Mth field, and then the optical noise correction processing shifts to step S408.

In step S408, the correction processing unit 62 acquires the optical noise characteristic information CdataM [x, y] in the Mth field. In this step S408, the correction processing unit 62 is an example of the “acquisition unit” according to the technique of the present disclosure.

In the next step S410, x = 1 and y = 1 are stored as coordinate data in the coordinate register, and then the optical noise correction process proceeds to step S412.

In step S412, the correction processing unit 62 calculates the amount of optical noise from the blank reading data of the coordinates [1,1] and the optical noise characteristic information. That is, the correction processing unit 62 calculates Ndata [1,1] using the conversion coefficient or calculation formula defined in CdataM [1,1]. Here, CalNdataM [1,1] refers to the calculated amount of optical noise.

In the next step S414, the correction processing unit 62 corrects the image data ImageM [1,1] at the coordinates [1,1] by using the noise map and the calculated light noise amount. The correction for ImageM [1,1] is subtracted from the image data ImageM [1,1] by multiplying the binarized noise map data NmapM [1,1] and the optical noise amount CalNdataM [1,1]. It is realized by being.

In the next step S416, the correction processing unit 62 determines whether or not the image data of all the coordinates has been processed. If the image data of all the coordinates is not processed in step S416, the determination is denied and the optical noise correction process proceeds to step S418. When the image data of all the coordinates is processed in step S416, the determination is affirmed, and the optical noise correction process shifts to step S420.

In step S418, the correction processing unit 62 increments the x-coordinate or the y-coordinate, the optical noise correction processing returns to step S412, and the processing after step S412 is sequentially performed.

In step S420, the correction processing unit 62 determines whether or not M is the same as the number of fields. If M is not the same as the number of fields in step S420, the determination is denied and the optical noise correction process proceeds to step S422.

In step S422, the correction processing unit 62 increments M by one, and the optical noise correction processing returns to step S404. The correction processing unit 62 sequentially performs the processing of the next field from step S404.

In step S420, if M is the same as the number of fields, the determination is affirmed, and the correction processing unit 62 ends the optical noise correction processing.

According to the above fifth embodiment, the amount of optical noise that must be corrected in each field can be calculated more accurately by using the optical noise characteristic information stored in advance. In particular, in the case of an image sensor having color sensitivity, the amount of optical noise can be calculated more accurately by providing optical noise characteristic information for each color.

(Sixth Embodiment)
Next, the sixth embodiment will be described. The image pickup apparatus 100 according to the sixth embodiment employs the ratio of the amount of light noise generated as the optical noise characteristic information instead of the optical noise characteristic information as compared with the image pickup apparatus 100 according to the fifth embodiment. The point is different. In this embodiment, the optical noise characteristic information includes a predetermined value as the optical noise of the region read out again by the correction processing unit 62 of the plurality of regions and the optical noise of the region different from the region of the plurality of regions. It is a value based on the ratio with the value predetermined as.

In the image pickup apparatus 100 according to the sixth embodiment, instead of the optical noise characteristic information CdataM [x, y] described in the fifth embodiment, the light noise amount PreNdataM [x, y] measured in advance and the first field The ratio with the blank reading data Ndata [x, y] is used. That is, "CdataM [x, y] = PreNdataM [x, y] / Ndata [x, y]". Further, the optical noise characteristic information CdataM [x, y] is preferably set for each color.

According to the image pickup apparatus 100 according to the sixth embodiment, the amount of optical noise that must be corrected in each field can be calculated more accurately and quickly by using the optical noise characteristic information stored in advance. it can. In particular, according to the image pickup device 100 according to the sixth embodiment, in the case of an image pickup device having color sensitivity, by providing light noise characteristic information for each color, the amount of light noise can be increased more accurately and quickly. Can be calculated.

(7th Embodiment)
Next, the seventh embodiment will be described as an example with reference to the flowchart shown in FIG. In the image pickup apparatus 100 according to the seventh embodiment, a method of correcting optical noise by a simpler method is adopted as compared with the imaging apparatus 100 described in each of the above embodiments. Specifically, the captured image data stored in the memory unit 53 is corrected for each of the plurality of regions according to the optical noise determined according to the region image data read out for each region by the correction processing unit 62. This is a method of obtaining corrected image data.

As an example, in the difference acquisition process shown in FIG. 18, first, in step S500, the initial value “2” is stored in the field number register M, and then the difference acquisition process shifts to step S502.

In step S502, the correction processing unit 62 takes in the image data Image M [x, y] of the Mth field and the image data Image (M-1) [x, y] of the (M-1) field, and then The difference acquisition process proceeds to step S504.

In step S504, the correction processing unit 62 acquires the difference data DifDataM [x, y] between the image data in the M field and the image data in the (M-1) field.
That is, DifDataM [x, y] is represented by "DifDataM [x, y] = ImageM [x, y] -Image (M-1) [x, y]".

The difference data DifDataM [x, y] corresponds to the optical noise generated in the M field between the time when the image data in the (M-1) field is read and the time when the image data in the M field is read. ..

In the next step S506, the correction processing unit 62 subtracts the difference data DifDataM [x, y] acquired in step S504 from the image data in the M field. As a result, the image data of the Mth field excluding the optical noise can be obtained.

In the next step S508, the correction processing unit 62 determines whether or not M is the same as the number of fields. If M is not the same as the number of fields in step S508, the determination is denied and the difference acquisition process proceeds to step S510.

In step S510, the correction processing unit 62 increments M by one, and the difference acquisition process returns to step S502. The correction processing unit 62 sequentially performs the processing of the next field from step S502.

In step S508, if M is the same as the number of fields, the determination is affirmed, and the correction processing unit 62 ends the difference acquisition process.

In summary, the corrected image data determines the pixel position having a difference from the area image data whose read order is later, based on the comparison result of the pair of area image data whose reading order is adjacent to each other, and determines the pixel position and the determined pixel position and It is obtained by correcting each area according to the difference.

According to the image pickup apparatus 100 according to the seventh embodiment, the first field is not read blank, and the difference between the adjacent fields in the reading order is acquired. Therefore, when the first field is read blank. Compared with, the optical noise of each field can be corrected more quickly.

(8th Embodiment)
Next, the eighth embodiment will be described as an example with reference to the flowchart shown in FIG. In the eighth embodiment, the image pickup apparatus 100 employs a method of selecting whether or not correction of optical noise described in the first to seventh embodiments is necessary.

FIG. 19 shows an example of the flow of noise correction necessity processing executed by the image processing circuit 61. As an example, as shown in FIG. 19, first, in step S600, the image processing circuit 61 is the imaging time of the imaging conditions set by the user in the manual mode or the imaging conditions set by the CPU 12 in the auto imaging mode. It is determined whether or not the exposure time is shorter than the predetermined time threshold value. Further, the image processing circuit 61 determines whether or not the subject has an image area having a brightness exceeding a predetermined threshold value in the live view image data stored in the memory unit 53. The image processing circuit 61 determines whether or not at least one of these two conditions is satisfied.

If at least one of the two conditions is satisfied in step S600, the determination is affirmed, and the noise correction necessity processing proceeds to step S602. If neither of the two conditions is satisfied in step S600, the determination is denied, and the noise correction necessity processing proceeds to step S604.

In step S602, the correction processing unit 62 executes the optical noise correction mode and obtains a corrected image. The optical noise correction mode refers to an operation mode in which the captured image data captured by the photoelectric conversion element 51 is corrected to remove the optical noise described in each of the above embodiments.

In step S604, the image processing circuit 61 executes a normal readout process of the captured image data captured by the photoelectric conversion element 51 without correction for removing the optical noise described in each of the above embodiments. To do.

In the eighth embodiment, the case where the processing of step S600 is executed by the image processing circuit 61 is illustrated, but the technique of the present disclosure is not limited to this. For example, the process of step S600 may be executed by the CPU 12, and the execution result by the CPU 12 may be transmitted to the image processing circuit 61.

When the exposure time is short, the reading time of the captured image data becomes relatively long. Therefore, the amount of optical noise generated during the readout time is relatively increased as compared with the optical image data from the subject obtained during the exposure time. That is, the influence of optical noise becomes large. Therefore, when the imaging time is shorter than a predetermined threshold value, the merit of performing optical noise correction becomes large. Further, when the subject is imaged by the image pickup apparatus 100, the amount of light noise generated increases as the brightness of the subject increases. Therefore, when the subject has a luminance region exceeding a predetermined threshold value, the merit of performing optical noise correction becomes large.

According to the image pickup apparatus 100 according to the eighth embodiment, when the image pickup time is less than the threshold value or the subject has an image region having brightness exceeding the threshold value, the image is taken in the optical noise correction mode, and other than that. In that case, shoot in the normal mode without optical noise correction. Therefore, according to the image pickup apparatus 100 according to the eighth embodiment, the frequency of correction for removing light noise from the captured image data under the light noise correction mode can be kept to the minimum necessary.

Further, as shown in FIG. 20 as an example, in step S610, the image processing circuit 61 may determine whether or not the imaging time is less than the threshold value and the subject has a luminance region exceeding the threshold value. In step S610, when the exposure time is less than the threshold value and the subject has a luminance region exceeding the threshold value, the determination is affirmed, and the noise correction necessity processing shifts to step S612.

Although the case where the process of step S610 is executed by the image processing circuit 61 is illustrated here, the technique of the present disclosure is not limited to this. For example, the process of step S610 may be executed by the CPU 12, and the execution result by the CPU 12 may be transmitted to the image processing circuit 61.

In step S612, the correction processing unit 62 executes a process corresponding to the process of step S602 shown in FIG. In step S614, the image processing circuit 61 executes a process corresponding to the process of step S604 shown in FIG. Therefore, even when the noise correction necessity processing shown in FIG. 20 is executed, the same effect as when the noise correction necessity processing shown in FIG. 19 is executed can be obtained.

The optical noise correction processing described in each of the above embodiments is merely an example. Therefore, it goes without saying that unnecessary steps may be deleted, new steps may be added, or the processing order may be changed within a range that does not deviate from the purpose.

In the above description, an example in which various processes related to the technique of the present disclosure are executed by the image processing circuit 61 is shown, but the technique of the present disclosure is not limited to this, and various programs related to the technique of the present disclosure are the CPU It may be realized by being executed by. Further, the technique of the present disclosure is not limited to this, and various programs related to the technique of the present disclosure may be executed by a CPU other than the CPU 12.

Further, the "various processes according to the technique of the present disclosure" referred to here refer to a difference acquisition process, a noise position determination process, a field image correction process, an optical noise correction process, and a noise correction necessity process. Further, the "various programs related to the technique of the present disclosure" referred to here refer to a difference acquisition program, a noise position determination program, a field image correction program, an optical noise correction program, and a noise correction necessity program.
That is, the difference acquisition process is realized by executing the difference acquisition program by the image processing circuit 61 or the CPU 12. Further, the noise position determination process is realized by executing the noise position determination program by the image processing circuit 61 or the CPU 12. Further, the field image correction process is realized by executing the field image correction program by the image processing circuit 61 or the CPU 12. Further, the optical noise correction processing is realized by executing the optical noise correction program by the image processing circuit 61 or the CPU 12. Further, the noise correction necessity processing is realized by executing the noise correction necessity program by the image processing circuit 61 or the CPU 12. In the following, when it is not necessary to distinguish between the difference acquisition program, the noise position determination program, the field image correction program, the optical noise correction program, and the noise correction necessity program, it is referred to as "program PG".
As an example, as shown in FIG. 21, the program PG may be stored in an arbitrary portable storage medium 700 such as an SSD, a USB memory, or a DVD-ROM. In this case, the program PG of the storage medium 700 is installed in the image pickup apparatus 100, and the installed program PG is executed by the CPU 12.

Further, the program PG is stored in a storage unit of another computer or server device connected to the image pickup apparatus 100 via a communication network (not shown), and the program PG is downloaded in response to the request of the image pickup apparatus 100. You may do so. In this case, the downloaded program PG is executed by the CPU 12 of the image pickup apparatus 100.

In the above embodiment, for example, various processors shown below can be used as hardware resources for executing various processes according to the technique of the present disclosure. Examples of the processor include, as described above, software, that is, a CPU, which is a general-purpose processor that functions as a hardware resource for executing various processes according to the technique of the present disclosure by executing a program. Further, examples of the processor include a dedicated electric circuit which is a processor having a circuit configuration specially designed for executing a specific process such as FPGA, PLD, or ASIC.

The hardware resource that executes various processes according to the technique of the present disclosure may be composed of one of these various processors, or a combination of two or more processors of the same type or different types (for example, a plurality of processors). It may be composed of a combination of FPGA or a combination of CPU and FPGA). Further, the hardware resource for executing various processes according to the technique of the present disclosure may be one processor.

As an example of configuring with one processor, first, as represented by a computer such as a client and a server, one processor is configured by a combination of one or more CPUs and software, and this processor is disclosed in the present disclosure. There is a form that functions as a hardware resource that executes various processes related to the above technology. Secondly, as typified by SoC, there is a form in which a processor that realizes the functions of the entire system including a plurality of hardware resources for executing various processes related to the technology of the present disclosure with one IC chip is used. .. As described above, various processes according to the technique of the present disclosure are realized by using one or more of the above-mentioned various processors as hardware resources.

Further, as the hardware structure of these various processors, more specifically, an electric circuit in which circuit elements such as semiconductor elements are combined can be used.

(9th Embodiment)
In each of the above embodiments, the image pickup device 100 has been illustrated, but examples of the portable terminal device which is a modification of the image pickup device 100 include a mobile phone, a smartphone, a PDA, a portable game machine, and the like having a camera function. Be done. In the following, a smartphone will be taken as an example and described with reference to the drawings.

FIG. 22 is a perspective view showing an example of the appearance of the smartphone 800. The smartphone 800 has a flat plate-shaped housing 802, and has a display input unit 820 in which a display panel 821 as a display unit and an operation panel 822 as an input unit are integrated on one surface of the housing 802. ing. Further, the housing 802 includes a speaker 831, a microphone 832, an operation unit 840, and a camera unit 841. The configuration of the housing 802 is not limited to this, and for example, a configuration in which the display unit and the input unit are independent may be adopted, or a configuration having a folding structure or a slide structure may be adopted.

FIG. 23 is a block diagram showing an example of the configuration of the smartphone 800 shown in FIG. 22. As an example, as shown in FIG. 23, the smartphone 800 has, as main components, a wireless communication unit 810, a display input unit 820, a communication unit 830, an operation unit 840, a camera unit 841, and a storage unit 850. It includes an external input / output unit 860. Further, the smartphone 800 includes a GPS receiving unit 870, a motion sensor unit 880, a power supply unit 890, and a main control unit 801 as main components. Further, as a main function of the smartphone 800, it is provided with a wireless communication function for performing mobile wireless communication via the base station device BS and the mobile communication network NW.

The wireless communication unit 810 performs wireless communication to the base station device BS accommodated in the mobile communication network NW according to the instruction of the main control unit 801. By using this wireless communication, various data such as voice data, image data, e-mail data, Web data, and / or streaming data are transmitted and received.

The display input unit 820 is a so-called touch panel, and includes a display panel 821 and an operation panel 822. Therefore, the display input unit 820 visually transmits information to the user by displaying still images, moving images, character information, and the like under the control of the main control unit 801 and detects the user operation for the displayed information. To do. When viewing the generated 3D, the display panel 821 is preferably a 3D display panel.

The display panel 821 is realized by using an LCD, OELD, or the like as a display device. The operation panel 822 is a device that visually mounts an image displayed on the display surface of the display panel 821 and detects one or more coordinates by being operated by a user's finger and / or a stylus. is there. When the device is operated with a user's finger and / or a stylus, a detection signal generated due to the operation is output to the main control unit 801. Next, the main control unit 801 detects the operation position (coordinates) on the display panel 821 based on the received detection signal.

The display input unit 820 includes the display panel 821 of the smartphone 800 and the operation panel 822 integrally. Specifically, the operation panel 822 is superposed on the display panel 821, and the operation panel 822 completely covers the display panel 821. When this arrangement is adopted, the operation panel 822 may have a function of detecting a user operation even in an area outside the display panel 821. In other words, the operation panel 822 includes a display area which is a detection area for the overlapping portion overlapping the display panel 821 and a non-display area which is a detection area for the outer edge portion which does not overlap the other display panel 821. May be good.

The size of the display area and the size of the display panel 821 may be completely matched, but it is not always necessary to match the two. Further, the operation panel 822 may be provided with two sensitive regions, an outer edge portion and an inner portion other than the outer edge portion. Further, the width of the outer edge portion is appropriately designed according to the size of the housing 802 and the like. Further, examples of the position detection method adopted by the operation panel 822 include a matrix switch method, a resistance film method, a surface acoustic wave method, an infrared method, an electromagnetic induction method, and a capacitance method, and any of these methods is adopted. You can also do it.

The communication unit 830 includes a speaker 831 and / or a microphone 832. The communication unit 830 converts the user's voice input through the microphone 832 into voice data that can be processed by the main control unit 801 and outputs the voice data to the main control unit 801. Further, the communication unit 830 decodes the voice data received by the wireless communication unit 810 or the external input / output unit 860 and outputs the voice data from the speaker 831. Further, for example, the speaker 831 can be mounted on the same surface as the surface on which the display input unit 820 is provided, and the microphone 832 can be mounted on the side surface of the housing 802.

The operation unit 840 is a hardware key using a key switch or the like, and receives an instruction from the user. For example, as shown in FIG. 22, the operation unit 840 is mounted on the side surface of the housing 802 of the smartphone 800, and is turned on when pressed with a finger or the like, and turned off by a restoring force such as a spring when the finger is released. It is a push button type (momentary operation method) switch.

The storage unit 850 stores address data associated with the program PG, control data, application software, the name of the communication partner, the telephone number, and the like. In addition, the storage unit 850 stores the data of the transmitted / received e-mail. In addition, the storage unit 850 stores the Web data downloaded by Web browsing and / or the content data downloaded by Web browsing. In addition, the storage unit 850 temporarily stores streaming data and the like. Further, the storage unit 850 has an internal storage unit 851 built in the smartphone and an external storage unit 852 having a detachable external memory slot. Each of the internal storage unit 851 and the external storage unit 852 constituting the storage unit 850 is realized by using a storage medium such as a flash memory type or a hard disk type. Other examples of the storage medium include a multimedia card micro type, a card type memory, RAM, or ROM.

The external input / output unit 860 is a device that acts as an interface with all external devices connected to the smartphone 800, and directly or indirectly communicates with other external devices via communication or the like or a network. It is connected as possible. Examples of communication with other external devices include USB. Networks include, for example, the Internet, wireless LAN, Bluetooth®, RFID, or IrDA®. In addition, other examples of the network include UWB (registered trademark) or ZigBee (registered trademark)).

Examples of the external device connected to the smartphone 800 include a wired headset, a wireless headset, a wired external charger, a wireless external charger, a wired data port, and / or a wireless data port. Another example of an external device connected to the smartphone 800 is a memory card connected via a card socket. Another example of an external device connected to the smartphone 800 is a SIM / UIM card. Another example of an external device connected to the smartphone 800 is an external audio / video device connected via an audio / video I / O terminal. In addition to external audio / video equipment, there are external audio / video equipment that is wirelessly connected. Further, instead of the external audio / video device, for example, a smartphone connected by wire or wirelessly can be applied. Further, instead of the external audio / video device, for example, a personal computer connected by wire or wirelessly can be applied. Further, instead of the external audio / video device, for example, a PDA connected by wire or wirelessly can be applied. Further, instead of the external audio / video device, for example, a personal computer connected by wire or wirelessly can be applied. Further, instead of the external audio / video device, for example, an earphone or the like can be applied.

The external input / output unit transmits the data transmitted from such an external device to each component inside the smartphone 800, or transmits the data inside the smartphone 800 to the external device.

The GPS receiving unit 870 receives GPS signals transmitted from the GPS satellites ST1 to STn according to the instruction of the main control unit 801 and executes positioning calculation processing based on the received plurality of GPS signals to determine the latitude of the smartphone 800. Detects the position expressed in longitude and / or altitude (current position of the smartphone 800). When the GPS receiving unit 870 can acquire the position information indicating the current position of the smartphone 800 from the wireless communication unit 810 or the external input / output unit 860, the GPS receiving unit 870 can also detect the position using the position information.

The motion sensor unit 880 includes, for example, a three-axis acceleration sensor, and detects the physical movement of the smartphone 800 according to the instruction of the main control unit 801. By detecting the physical movement of the smartphone 800 by the motion sensor unit 880, the moving direction and acceleration of the smartphone 800 are detected. This detection result is output to the main control unit 801.

The power supply unit 890 supplies the electric power stored in the battery (not shown) to each unit of the smartphone 800 according to the instruction of the main control unit 801.

The main control unit 801 includes a microprocessor and operates according to the program PG and control data stored in the storage unit 850 to control each unit of the smartphone 800. Further, the main control unit 801 is provided with a mobile communication control function that controls each unit of the communication system in order to perform voice communication and data communication through the wireless communication unit 810. The main control unit 801 also has an application processing function.

The application processing function is realized by operating the main control unit 801 according to the application software stored in the storage unit 850. Examples of the application processing function include an infrared communication function, an e-mail function, a Web browsing function, and the like. The infrared communication function is a function of performing data communication with an opposite device by controlling the external input / output unit 860. The e-mail function is a function for sending and receiving e-mail. The Web browsing function is a function for browsing a Web page.

Further, the main control unit 801 has an image processing function. The image processing function is a function of displaying an image on the display input unit 820 based on the received data and / or the still image such as the downloaded streaming data and / or the moving image data. That is, the image processing function refers to a function in which the main control unit 801 decodes the image data, performs image processing on the decoding result, and displays the image on the display input unit 820.

Further, the main control unit 801 executes display control for the display panel 821 and operation detection control for detecting a user operation through the operation unit 840 and the operation panel 822.

When the display control is executed, the main control unit 801 displays a window for displaying an icon for starting the application software and a soft key such as a scroll bar, or for composing an e-mail. The scroll bar refers to a soft key for receiving an instruction to move a display portion of an image for a large image or the like that cannot fit in the display area of the display panel 821.

Further, by executing the operation detection control, the main control unit 801 detects the user operation through the operation unit 840, operates the icon through the operation panel 822, and inputs a character string to the input field of the window. Accepts input. Further, when the operation detection control is executed, the main control unit 801 receives a scroll request of the display image through the scroll bar.

Further, the main control unit 801 has a touch panel control function. When the operation detection control is executed, the main control unit 801 has the overlapped portion (display area) where the operation position with respect to the operation panel 822 overlaps the display panel 821, or the outer edge portion (non-display) which does not overlap with the other display panel 821. Area). Then, when the main control unit 801 activates the touch panel control function, the main control unit 801 receives the determination result and controls the sensitive area of the operation panel 822 and the display position of the soft key.

Further, the main control unit 801 can also detect a gesture operation on the operation panel 822 and execute a preset function according to the detected gesture operation. Gesture operation is not a conventional simple touch operation, but draws a trajectory with a finger or the like, specifies multiple positions at the same time, or combines these to draw a trajectory from at least one of a plurality of positions. Means operation.

The camera unit 841 is a digital camera that captures images using a CMOS sensor, and has the same functions as the imaging device 100 shown in FIG. 1 and the like.

Further, the camera unit 841 can switch between the manual focus mode and the autofocus mode. When the manual focus mode is selected, the shooting lens of the camera unit 841 is focused by operating the focus icon button or the like displayed on the operation unit 840 or the display input unit 820. Further, in the manual focus mode, for example, a live view image in which a split image is combined is displayed on the display panel 821 so that the focusing state at the time of manual focus can be confirmed. The hybrid finder 220 shown in FIG. 1 may be provided in the smartphone 800.

Further, the camera unit 841 converts the image data obtained by imaging into compressed image data such as JPEG under the control of the main control unit 801. Then, the image data obtained by conversion is recorded in the storage unit 850, or output through the external input / output unit 860 and / or the wireless communication unit 810. As shown in FIG. 22, in the smartphone 800, the camera unit 841 is mounted on the same surface as the display input unit 820, but the mounting position of the camera unit 841 is not limited to this, and even if it is mounted on the back surface of the display input unit 820. Alternatively, a plurality of camera units 841 may be mounted. When a plurality of camera units 841 are mounted, the camera unit 841 used for imaging can be switched to perform imaging independently, or the plurality of camera units 841 can be used at the same time to perform imaging. It will be done.

Further, the camera unit 841 is used for various functions of the smartphone 800. For example, the image acquired by the camera unit 841 is displayed on the display panel 821. Further, an image of the camera unit 841 is used as one of the operation inputs of the operation panel 822. Further, when the GPS receiving unit 870 detects the position, the position is detected by referring to the image from the camera unit 841. Further, the main control unit 801 determines the optical axis direction of the camera unit 841 of the smartphone 800 by referring to the image from the camera unit 841 without using the 3-axis acceleration sensor, or determines the current usage environment. To do. Further, the main control unit 801 can be used in combination with the three-axis acceleration sensor to determine the optical axis direction of the camera unit 841 of the smartphone 800 and to determine the current usage environment. Of course, the image from the camera unit 841 can also be used in the application software.

In addition, the main control unit 801 adds various information to the image data of the still image or moving image, records the image data to which the various information is added in the storage unit 850, or outputs the image data through the input / output unit 860 or the wireless communication unit 810. To do. Examples of the "various information" referred to here include position information acquired by the GPS receiver 870 and / or audio information acquired by the microphone 832 in the image data of a still image or a moving image. As the voice information, the text information obtained by performing the voice-to-text conversion by the main control unit or the like may be used. In addition to this, the "various information" may include posture information and the like acquired by the motion sensor unit 880.

The contents described and illustrated above are detailed explanations of the parts related to the technology of the present disclosure, and are merely examples of the technology of the present disclosure. For example, the above description of the configuration, function, action, and effect is an example of the configuration, function, action, and effect of a portion according to the art of the present disclosure. Therefore, unnecessary parts may be deleted, new elements may be added, or replacements may be made to the described contents and illustrated contents shown above within a range that does not deviate from the gist of the technique of the present disclosure. Needless to say. In addition, in order to avoid complications and facilitate understanding of the parts related to the technology of the present disclosure, the description contents and the illustrated contents shown above require special explanation in order to enable the implementation of the technology of the present disclosure. The explanation about common technical knowledge is omitted.

As used herein, "A and / or B" is synonymous with "at least one of A and B." That is, "A and / or B" means that it may be only A, only B, or a combination of A and B. Further, in the present specification, when three or more matters are connected and expressed by "and / or", the same concept as "A and / or B" is applied.

All documents, patent applications and technical standards described herein are to the same extent as if the individual documents, patent applications and technical standards were specifically and individually stated to be incorporated by reference. Incorporated by reference in the book.

This application claims the priority of Japanese Patent Application No. 2018-141678, which is a Japanese application filed on July 27, 2018, and the entire contents of this application are incorporated herein by reference.

Claims (21)

The image data imaged by an image sensor equipped with a plurality of photoelectric conversion elements and transferred to the memory unit on which optical noise is superimposed is read out as area image data for each of the plurality of divided areas of the memory unit. After the reading of each area image data is completed, the reading unit that reads the data of the predetermined area again, and the reading unit.
The captured image data imaged by the image sensor and stored in the memory unit is obtained by being corrected for each of the plurality of regions according to the optical noise determined according to the data read again by the reading unit. An output unit that outputs corrected image data and
Image processing equipment including. The image processing apparatus according to claim 1, wherein the predetermined area is an area in which the area image data is first read from the memory unit. In the corrected image data, the pixel position having the optical noise is determined from the area image data whose reading order by the reading unit is later, based on the comparison result of a pair of region image data whose reading order is adjacent to each other by the reading unit. The image processing apparatus according to claim 1 or 2, which is obtained by correcting each region according to the determined pixel positions and the amount of optical noise. The image processing apparatus according to claim 3, wherein the comparison result is a difference between the image data of each of the pair of adjacent region image data. The image processing apparatus according to claim 3 or 4, wherein the plurality of photoelectric conversion elements have sensitivity for each of a plurality of predetermined primary colors. Each of the area image data is the area image data in which the image data stored in the memory unit is thinned out in group units in which the photoelectric conversion elements having sensitivity for each of the plurality of primary colors have a predetermined arrangement. The image processing apparatus according to claim 5. The image processing apparatus according to claim 6, wherein the comparison result is a result of comparison after the pair of region image data are simultaneously processed. The pixel position is determined based on the result of filtering the comparison result of the pair of region image data, or is determined based on the comparison result of comparison after the pair of region image data is filtered. The image processing apparatus according to any one of claims 3 to 7. Any one of claims 1 to 8 in which the reading unit performs a process of re-reading the data after the reading of each of the plurality of the area image data is completed when the predetermined imaging conditions are satisfied. The image processing apparatus according to the section. The imaging conditions are that the imaging time by the image sensor is shorter than a predetermined time, and that there is an image region in the image data stored in the memory unit whose brightness exceeds the predetermined brightness. The image processing apparatus according to claim 9, which is at least one of the conditions. Further including an acquisition unit for acquiring the optical noise characteristic information from a storage unit in which the optical noise characteristic information indicating the optical noise characteristics for each of the plurality of regions is stored in advance.
The corrected image data is any one of claims 1 to 10 obtained by correcting the captured image data for each region according to the optical noise and the optical noise characteristic information acquired by the acquisition unit. The image processing apparatus according to the section. The optical noise characteristic information includes a predetermined value as the optical noise of the region read again by the reading unit of the plurality of regions and the optical noise of a region different from the region of the plurality of regions. The image processing apparatus according to claim 11, which is a value based on a ratio to a predetermined value. A reading unit that reads out image data imaged by an image sensor equipped with a plurality of photoelectric conversion elements and transferred to a memory unit on which optical noise is superimposed as area image data for each of the plurality of divided areas of the memory unit. When,
The captured image data captured by the image sensor and stored in the memory unit is corrected for each of the plurality of regions according to the optical noise determined according to the region image data read for each region by the reading unit. An output unit that outputs the corrected image data obtained in
Image processing equipment including. In the corrected image data, pixel positions having a difference are determined from the area image data whose reading order by the reading unit is later, based on the comparison result of a pair of area image data whose reading order is adjacent to each other by the reading unit. The image processing apparatus according to claim 13, wherein the image processing apparatus is obtained by correcting for each of the regions according to the predetermined pixel positions and the differences. The image processing according to any one of claims 1 to 14, wherein the region is obtained by thinning out the memory portions of the photoelectric conversion elements arranged in a matrix manner on a row-by-row basis by a predetermined method. apparatus. The image processing apparatus according to any one of claims 1 to 15, further comprising a control unit that controls the display unit to display an image based on the corrected image data output by the output unit. The image processing apparatus according to any one of claims 1 to 16.
A reception unit that receives an instruction to start imaging to the image sensor, and a reception unit.
Imaging equipment including. The image data captured by the image sensor and transferred to the memory unit on which the optical noise is superimposed is read out as area image data for each of the plurality of divided areas of the memory unit, and the area image data is read out. After finishing, read the data in the predetermined area again and read it again.
The imaged image data imaged by the image sensor and stored in the memory unit is corrected for each of the plurality of areas according to the optical noise determined according to the data read again, and the corrected image data obtained is output. Image processing methods that include doing. The image data captured by the image sensor and transferred to the memory unit on which the optical noise is superimposed is read out as area image data for each of the plurality of divided areas of the memory unit.
A corrected image obtained by correcting the captured image data captured by the image sensor and stored in the memory unit for each of the plurality of regions according to the optical noise determined according to the region image data read out for each region. An image processing method that includes outputting data. On the computer
The image data captured by the image sensor and transferred to the memory unit on which the optical noise is superimposed is read out as area image data for each of the plurality of divided areas of the memory unit, and the area image data is read out. After finishing, read the data in the predetermined area again and read it again.
The imaged image data imaged by the image sensor and stored in the memory unit is corrected for each of the plurality of areas according to the optical noise determined according to the data read again, and the corrected image data obtained is output. A program for executing processing including doing. On the computer
The image data captured by the image sensor and transferred to the memory unit on which the optical noise is superimposed is read out as area image data for each of the plurality of divided areas of the memory unit.
A corrected image obtained by correcting the captured image data captured by the image sensor and stored in the memory unit for each of the plurality of regions according to the optical noise determined according to the region image data read out for each region. A program for executing processing including outputting data.

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